Feed mechanism for broaching machines



L. SANDLER June 21, 1932.

MECHANISM FOR BROACHING-MACHINES Filed April 1, 1951 4 Sheets-Sheet q J IL INVENTOR. Lou/5 Sand/ex" ZEWK A ATTO | 'SANDLER June 21, 1932.

FEED MECHANISM-FOR BROACHING MACHINES 4 Sheets-Sheet 2 Filed April 1, 1931 INVENTOR. Lou/.5 Sand/er 101 M2 A'TTORNEY June 21, 1932. SANDLER 1,864,322

FEED MECHANISM FOR BROACHING MACHINES Filed April 1, 1951 4 Sheets-Sheet 3 I INVENTOR, Laws 50/7 072/" A TTORNEY June 21, 1932.

L. SANDLER FEED MECHANISM FOR BROACHING MACHINES Filed April 1, 1931 4 Sheets-Sheet 4 N N E R Wm wm 5 0A U 0 L Y B Patented June 21, 1932 UNITED STATES PATENT oFFicE.

LOUIS SANDLER, OF NEW CASTLE, PENNSYLVANIA, ASSIGN'OR-TO JOHNSON BRONZE: COMPANY, OF NEW CASTLE, PENNSYLVANIA, A CORPORATION OIE"YEEN'1\l'SYII-VJ-XIWIA.

EEED"MECHANISM FOR BROACI-IING. MACHINES Application filed .April 1, 1931. Serial No. 526,863.

improvements in such machines by means of which the initially formed bushings, when fed thereto, are each automatically carried through the interior finishing process thereof and discharged therefrom without further manual assistance and without any necessity of stopping the press during its operation.

Further 01)]6CtS are to provide a mach ne capable of increasing production of interlor finished bushings at a saving of time and labor; simplify the construction and operation of-the mechanism; be positive in its operation, etc.

In the accompanying drawings, I have shown the invention and parts thereof by means of various views, wherein- Figure l is a side elevation of the complete machine.

Fig. 2 is a rear elevation of part of the machine, enlarged.

Fig. 3 is a plan view of the machine, in section, on the line IIIIII of Fig. 2.

Fig. 4: is also a plan view of the same, in section, on the line IV-IV of Fig. 2.

Fig. 5 is a side elevation of a portion of the operating mechanism, enlarged.

Fig. 6 is an enlarged view of one of the broaching or finishing tools, in part.

Fig. 7 is a similar view of one of the final finishing tools.

Fig. 8 is an enlarged fragmentary portion of the mechanism.

Fig. 9 is an enlarged plan view of one part ofan instrument for conveyin the bushing in 2: its course throughthe machine.

Fig. 10 is a side elevation of the deviceshown in Fig. 9, and

Fig. 11 is a side elevation of another portion of the mechanism.

In describing the machine in detail, similar numerals of reference are employed to indicate like detail parts where they occur in the several views.

As here shown, the press frame comprises abase 1,.table 2, and standards 3 provided at the upper endwith a cap 3; The frame has, i

a vertically movable working head or. ram 5:

slidably fitted within channels 6 of the standards. The ram is operated from an electric motor 7 by means ofa belt 8 passing over'a pulley 9,.on the motor shaft 9, and the flywheel- 10, on the shaft 10 supported in brackets'9", there being a gear pinion 11 on the fly wheel shaft which meshes with a gear wheel 11 upon the outer end of the crank shaft 12. The crank shaft, in turn, is connected; to the ram.5 by a pitman rod l3 and adjustable member 13 The particular form of press, as above outlined, is old in the art, and although it is such as is well adapted to my improvements thereon, any'other conventional form, may be substituted therefor.

Upon the table 2 I secure a work plate 14 provided with grooves 16 and 17 within which are fittedthe two pairs of slide bars 18' and 19, retained in position by means of guides 20 and 21 securedto the plate.

Between eachset of slide bars 18 and 19,-

are disposeda set of equally spaced and alined bushing operating instruments 22, 23 and 24: (see Figs. 3 aud t). Each instrument comprises a pair of oppositely disposed coacting angularly formedmembers or levers 25, (see Figs. 9 and 10), having a cylindrical pivotalside extension 26 movably engaging in a correspondingly formed. recess 27 of the said slide bars 18 and 19, said instruments'and slides comprising a unit movable in alternate directions. Each of the instrument levers is provided with a jaw portion 28 at its forward end, the extreme end being tapered'rearward' ly to a notch 29 in the side thereof. The slide bars to which they are attached, are each provided with cavities 30 withineach of which is fitted a spring 31 and pin 32, said pins being in engagement with the instrument levers, thus placing the levers of each instrument under like tension in the opening and closing thereof, as later apparen The levers of each of the rear instruments 24L vary slightly in structure overthe others, in that the jaw portions are of substantially hook formation to permit a finishedbu-shing being freely released therefrom. Theunder sides of the jaw portions of the forward instrument 22 of each set have an undercut portion 33 (see Fig. 10) so as to clear the abutments 34 when moved in their forward positions.

Formed through the work plate are openings alining with the finishing tools, as later described as carried by the ram, and have re movably secured therein the flanged bushings 35 into or through which the tools are adapted to extend during operation.

The broaching tool 36 is initially employed for rough finishing the interior of the sleeve and the other broaohing tool 37 for final finishing of the same, the latter having a loosely tted sleeve 38 thereon provided with angularly disposed cutters 39 for forming oil grooves therein during said final finishing. o Secured across the work board, upon the 0 guide bars and 21, by bolts 40 and 41, is

a stripper plate 42 having bushings 43 therein which aline with the aforesaid tools, and are adapted to strip the bushings from the 1 tools in ascending.

To the standards, at the rear sides thereof, are secured a pair of outstanding brackets 44-44 to support a shaft 45, said shaft having secured thereto the downwardly disposed 1 side levers -4646 and the intermediate levers v 47 47 The side levers are hingedly attached to the outer slide bars 18 by links 48 and the intermediate levers to the inner slide bars 19 by a link 19. i I To provide precise registration of the notches in the jaws of the gripping instruments, with the openings in the work plate, the brackets 4444 have each a partition or wall 49 formed therein, see Fig. 11, into which are threadably secured the bolts 50 and 50 each having a jam nut 51 thereon, said bolts being each adjusted to engage the levers in their movements in both directions.

To prevent the shaft to which the lever mechanism is secured from moving too freely, a brake or retarding mechanism is em ployed comprising a brake drum 52 fixed to the one end of the shaft, and a brake strap member 53 secured to the standard adjacent thereto, adjusting means for increasing or diminishing the friction being provided on the strap member.

Secured to the ram 5 is a bracket 54 to which is mo vably attached, by a pin 55, a link 56, said link being connected, through its slot,

55 to the intermediate levers 47 by a pin 57. The exact position of the pin within the slot of the link, to correspond with the movement of the sleeve operating mechanism, is determined by adjusting the pin bearing 58 with- 69 in the link slot by means of an adjusting screw 59 and retained in its adjusted position by the nut 60.

In the rear of the work plate, where each of the instruments 25 are disposed, is formed an incline 62 down which the finished bushings descend when finished and released by the rear instrument.

In the machine illustrated, the instruments are shown as in their rearward positions, each instrument being shown as having a bushing 61 in its grasp, the two forward ones of the sets holding bushings aligning with the tools and the rear instruments discharging thebushings therefrom.

Operation The motor being set in motion, both of the tools will be caused to descend by the intermediate mechanism connecting the motor with the ram. In their descent, the tools are intended to pass through both the bushings in the stripper plate, also through the bushings to be operated on, and into the bushings therebeneath in the work plate.- In the beginning of the descent of the ram with its tools the slides with their attached instruments remain stationary, due to the connecting link 46 being then in position to freely slide over the pin 57 of the intermediate levers 47, until'the said link has descended into engagement with the said pin 57, by which time the tools have entered the bushings 61-61 in line therewith in the finishing operations, thus holding said bushings fast, with the instruments 22 and 23 still engaging same.

In moving forward, the jaws of each instrument encounters a bushing causing said jaws to spread apart and then close upon the bushing, that is to say, that the forward instrument 22 releases itself from the bushing being rough finished by the tool 36 and grasps the blank or unfinished bushing, shown by dotted lines, placed against the stop 34, the intermediate instrument 23 grasps the one about the first or rough finishing tool, formerly held by the first instrument, and the rear instrument 24 grasps the sleeve formerly held by the other or final finishing tool and the intermediate instrument. The exact distance of the forward movement is limited by the lever 46 contacting with the bracket screw 50'.

As the ram ascends, the tools are with drawn without moving the instruments, due

to the link being then again in position to slide upon the pin 45 until the levers 46 again come in contact with the other screw 50 of the bracket. The ram then having ascended far enough to withdraw the tools out of the sleeves and through the stripper plate, the slides move the instruments rearward.

When moved rearward, the blank bushing will then be transferred in position to be operated upon by the first or roughing tool, that which had been operated upon by the roughing tool will be transferred in position to be operated on by the finishing tool, and that having been operated upon by the finishing tool will be transferred to and discharge at the rear where it descends the incline.

The above represents one complete cycle or alternate operation, or stepping of a sleeve through the machine, it being understood that the stepping of the bushings is repeated as long as the machine is in use and the attendant continues to place blanks against the abutments 34 during the rearward movement 10 of the instruments.

The bushings in the work plate as Well as those in the stripper plate are adapted to be removed and replaced by others better suited for larger or smaller tools and bushings, as

15 occasion requires.

While I have shown and described a specific embodiment of my invention I desire that said embodiment be regarded as illustrative only, and that the appended claims 20 shall be accorded the broadest construction consistent with the prior art.

Having thus shown and described my invention, what I regard as my invention and I desire to secure by Letters Patent, is- 1. In a machine of the class described, the combination of a pair of slides mounted on the work table thereof, a shaft, a pair of levers fixed to said shaft and connected to said slides, a second pair of levers also fixed to said shaft and provided with a connecting pin at their ends, a link lever pivotally connected to the ram of the machine and having a slidable connection through its slot with the said lever pin, a brake drum also secured to said shaft, and a flexible brake strap mem ber surrounding said drum, said link lever having an adjustable hearing within one end of its slot, and said brake strap member having adjustable pressure means thereon.

2. In a machine of the class described, the combination of a pair of slides mounted on a work table thereof, a shaft, a pair of levers fixed to said shaft and connected to said slides by a pair of links, a second pair of levers also connected to said shaft and provided with a connecting pin at their ends, a link lever pivotally connected to the ram of the machine and having a slidable connection with said lever pin, a brake drum also secured to said shaft, a flexible brake strap member surrounding said drum, and means carried by the machine to be engaged by and limit the movement of the first mentioned levers, N said link lever having an adjustable bearing Within one end of its slot, and said brake strap member having adjustable pressure means thereon.

In testimony whereof I aflix my signature.

LOUIS SANDLER. 

